How to add a specific amount of loop cuts without the mouse
Yes you can. Here's how:

with the element selected, hit → Tab
hit ⎈ Ctrl + R and hover your mouse to activate the loop visualiser
hit 5 (if you want 5 cuts)
hit ⏎ Enter
enter a number between -1 and 1 to define the offset of the cuts, or use the arrow keys to move them in increments
hit ⏎ Enter